Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4089267.

3D print an enlarged snoopy https://www.thingiverse.com/thing:2792617

You need a letter. Paint it red and put black lines on.

The letterbox I used https://www.bunnings.com.au/sandleford-black-economy-crest-post-mounted-letterbox_p3210120

Font used for the numbers is bones

I enlarge the size of the part to about 220%.

After gluing the parts together and gluing on Snoopy to the letterbox, clear coat the printed parts to make it last longer outside.

Files updated 8/01/2020